accounting for directories in file path

wayshot/src/cli.rs

@@ -11,7 +11,7 @@ use clap::builder::TypedValueParser;
 #[derive(Parser)]
 #[command(version, about)]
 pub struct Cli {
-    /// Where to save the screenshot, "-" for stdout. Defaults to "$UNIX_TIMESTAMP-wayshot.$EXTENSION".
+    ///Provide a custom file path ( encoding format is inferred from the file extension ). If path provided is directory then the output image is saved to provided path with default naming scheme. Default path is ./ , `-` indicates writing to terminal (stdout).
     #[arg(value_name = "OUTPUT")]
     pub file: Option<PathBuf>,
 

wayshot/src/wayshot.rs

@@ -53,10 +53,13 @@ fn main() -> Result<()> {
     }
 
     let file = match cli.file {
-        Some(pathbuf) => {
+        Some(mut pathbuf) => {
             if pathbuf.to_string_lossy() == "-" {
                 None
             } else {
+                if pathbuf.is_dir() {
+                    pathbuf.push(utils::get_default_file_name(requested_encoding));
+                } 
                 Some(pathbuf)
             }
         }